I am still on my quest, and a recent great deal on an LG 50PZ950 plasma has me back to two sets duking it out again. The competitor being a Vizio (yes Vizio) E3D470VX.
I have them side by side and tweaked to match one another as best as I can. Of course, one remote controls both of them, including power, volume, tuner, and all menu changes!
I have an admitted Plasma bias, but I am shocked at how close this mid-level Vizio matches up next to the "flagship" LG plasma. Colors, and saturation both look fantastic. The menu system, especially for streaming services and "widgets" on the Vizio is FAR FAR FAR superior. It is much quicker, easier, less cumbersome, and has many more choices. Really LG, no Pandora?!
The biggest hang-up is of course the black levels. While according to these forums LG's blacks are no good, I think they are perfectly good to great. It adds considerably more "pop" to the picture and dark scenes and shadow details are black. I don't necessarily find that the Vizio is "grey" its just that the blacks have a very noticeable blue tint to them. Very distracting. I have tried to get rid of it with temperature and bias adjustments but just cant.
Despite this, and the awesome picture of the LG, I am conflicted simply because of the LG's great menu system, streaming options, and passive 3D. Bottom line though is movie watching is much more enjoyable on the LG and its physical design is much more appealing and stylish.